问题
选择题
—You were not listening；what troubled you?
—I my coming math exam．
A．am thinking about
B．was thinking about
C．had thought about
D．will think about
答案
答案：B
考查时态.句意:你没有在听.什么困扰你了?我正在想来临的数学考试。可知答语中叙述的是过去（刚才没有听时）的动作，故用过去进行时态，选B。